From 94656b7cc0d479ad5508afa2e04a35a3bcdb9ea0 Mon Sep 17 00:00:00 2001
From: Jared Ballou <github@jballou.com>
Date: Tue, 19 Jan 2016 03:47:23 -0500
Subject: [PATCH] Added GitHub Hash into functions

---
 Insurgency/insserver     | 10 +++++
 functions/github_hash.sh | 82 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 92 insertions(+)
 create mode 100755 functions/github_hash.sh

diff --git a/Insurgency/insserver b/Insurgency/insserver
index 5dbadaeac..757456721 100755
--- a/Insurgency/insserver
+++ b/Insurgency/insserver
@@ -37,6 +37,10 @@ scriptcfgdir="${lgsmdir}/cfg/servers"
 # Temporary cache location
 cachedir="${lgsmdir}/tmp"
 
+# Git last commit file (for tracking updates)
+lastcommit_file="${cachedir}/lastcommit"
+
+
 # Debugging, if debugflag exists send output to $debuglog
 debugflag="${lgsmdir}/.dev-debug"
 debuglog="${lgsmdir}/dev-debug.log"
@@ -129,6 +133,8 @@ fn_getgithubfile(){
 			chmod +x "${filepath}"
 		fi
 		fn_colortext 32 "DONE"
+	else
+		fn_check_github_files "${lgsmdir}" "${lgsmdir}/${filename}"
 	fi
 	if [ "${exec}" ]; then
 		source "${filepath}"
@@ -140,8 +146,12 @@ fn_runfunction(){
 	scriptfile=${1:-$functionfile}
 	functionfile=$scriptfile
 	fn_getgithubfile "functions/${functionfile}" 1
+	fn_check_github_files "${lgsmdir}" "${lgsmdir}/functions/${functionfile}"
 }
 
+# Load GitHub hashing and updating functions
+fn_runfunction github_hash.sh
+
 # Process game configs and load variables needed to run script
 fn_runfunction game_settings.sh
 
diff --git a/functions/github_hash.sh b/functions/github_hash.sh
new file mode 100755
index 000000000..eb707fffc
--- /dev/null
+++ b/functions/github_hash.sh
@@ -0,0 +1,82 @@
+#!/bin/bash
+# LGSM git manifest functions
+# Author: Jared Ballou
+# Website: http://gameservermanagers.com
+#
+# This is another one of my POC tools. Eventually I want to have a pretty robust update/download system here
+# Goals:
+#  * Keep function files up to date on client machines
+#  * Deploy other programs or support tools
+#  * Learn more about GitHub API
+#  * Parse JSON in Bash
+
+# fn_get_git_hash $filename
+# Calculate the Git hash for a file
+function fn_get_git_hash(){
+	filename=$1
+	if [ -e $filename ]
+	then
+		filesize=$(stat --format='%s' $filename)
+		if [ "$(tail -c1 $filename)" == "" ]; then
+			printf "blob %d\0%s\n" "${filesize}" "$(cat $filename)" | sha1sum | awk '{print $1}'
+		else
+			printf "blob %d\0%s" "${filesize}" "$(cat $filename)" | sha1sum | awk '{print $1}'
+		fi
+	fi
+}
+
+fn_get_github_manifest(){
+	# Create cache directory if missing
+	if [ ! -e "${cachedir}" ]; then
+		mkdir -p "${cachedir}"
+	fi
+	# Get latest commit from GitHub. Cache file for 60 minutes
+	if [ -e $lastcommit_file ]; then
+		if [ $(($(date +%s) - $(date -r ${lastcommit_file} +%s))) -gt 3600 ]; then
+			fetch=1
+		else
+			fetch=0
+		fi
+	else
+		fetch=1
+	fi
+	if [ $fetch -eq 1 ]; then
+		echo "Fetching ${lastcommit_file}"
+		curl -s "https://api.github.com/repos/${githubuser}/${githubrepo}/git/refs/heads/${githubbranch}" -o "${lastcommit_file}.json"
+		${lgsmdir}/functions/jq-linux64 -r '.object.sha' "${lastcommit_file}.json" > "${lastcommit_file}"
+	fi
+	# Get manifest of all files at this revision in GitHub. These hashes are what we use to compare and select files that need to be updated.
+	manifest="${cachedir}/$(cat "${lastcommit_file}").manifest"
+	if [ ! -e "${manifest}.json" ]; then
+		curl -Ls "https://api.github.com/repos/${githubuser}/${githubrepo}/git/trees/${githubbranch}?recursive=1" -o "${manifest}.json"
+	fi
+	if [ ! -e "${manifest}" ]; then
+		${lgsmdir}/functions/jq-linux64 -r '.tree[] | .path + " " + .sha' "${manifest}.json" > "${manifest}"
+	fi
+}
+
+# Check files against manifest
+fn_check_github_files(){
+	prefix=$1
+	files=${@:2}
+	fn_get_github_manifest
+	manifest="${cachedir}/$(cat "${lastcommit_file}").manifest"
+	# Check all files in functions for updates
+	for file in $files; do
+		if [ -d $file ]; then
+			echo "Descending into ${file}..."
+			fn_check_github_files "${prefix}" ${file}/*
+		else
+			myhash=$(fn_get_git_hash $file)
+			repofile=$(echo $file | sed -e "s|${1}[/]*||g")
+			githash=$(grep "^$repofile " $manifest 2>/dev/null| cut -d" " -f2)
+			if [ "${githash}" == "" ]; then
+				echo "Can't find ${repofile} in git!"
+			elif [ "${myhash}" != "${githash}" ]; then
+				echo "Would fetch ${repofile}: have ${myhash}, expected ${githash}"
+			else
+				echo "${repofile} is OK"
+			fi
+		fi
+	done
+}